Last month Lisa Cadmus-Bertram, PhD and her research team at the University of Wisconsin published a study of wearable fitness trackers in the Annals of Internal Medicine. The study looked at how four popular trackers compared with an electrocardiogram and against each other for heart rate monitoring accuracy. Interpretation of the results by news media so far has been cautiously optimistic. Here's CNN's and ABC's coverage. My pals at LA Radio Studio and the Phil Hulett and Friends Show invited me on the air last week to discuss the study and how it may change the way we interact with our wearables.